Python

What is Python ?
Python is a simple, easy to learn, powerful, high level and object-oriented programming language.

History of python ?

The implementation of Python was started in the December 1989 by Guido Van Rossum at CWI in Netherlands.
ABC programming language is said to be the predecessor of Python language which was capable of Exception Handling and interfacing with Amoeba Operating System.

Features of python :

Pro's of Python :

Python is easy to learn.
Supports multiple systems and platforms.
Object Oriented Programming-driven.
Gives rise to quick development by using less code. Even a small team can handle Python effectively.
Allows to scale even the most complex applications with ease.
A large number of resources are available for Python.

Con's of Python :

Setup & Installation :

Double click on the downloaded file and click on default installation or customized installation.

Basic concepts in Python :

Variable :

Variable is a name which is used to refer memory location. Variable also known as identifier and used to hold value.
Python does not bound us to declare variable before using in the application. It allows us to create variable at required time.
We don't need to declare explicitly variable in Python. When we assign any value to the variable that variable is declared automatically.
Python allows us to assign a value to multiple variables in a single statement which is also known as multiple assignment.

String :

string is a built-in type text sequence. It is used to handle textual data in python.
We can simply create Python String by enclosing a text in single as well as double quotes. Python treat both single and double quotes statements same.
Both forward as well as backward indexing are provided using Strings in Python. Forward indexing starts with 0,1,2,3,....Backward indexing starts with -1,-2,-3,-4,....
Program to string concatenation.

List :

List is a data structure which is used to store various types of data.
Lists are mutable i.e., Python will not create a new list if we modify an element of the list.
It works as a container that holds other objects in a given order. We can perform various operations like insertion and deletion on list.
A list can be composed by storing a sequence of different type of values separated by commas.
Python list is enclosed between square([]) brackets and elements are stored in the index basis with starting index 0.

Exception Handling :

Exception can be said to be any abnormal condition in a program resulting to the disruption in the flow of the program.
The malicious code (code having exception) is enclosed in the try block.
Try block is followed by except statement. There can be multiple except statement with a single try block.
Except statement specifies the exception which occurred. In case that exception is occurred, the corresponding statement will be executed.
At the last we can provide else statement. It is executed when no exception is occurred.
Finally block will always be executed irrespective of the exception.
We can explicitly throw an exception in Python using ?raise? statement. raise will cause an exception to occur and thus execution control will stop in case it is not handled.

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